com.bumptech.glide.gifdecoder.GifDecoder# BitmapProvider ( ) 源码实例Demo

public GifState(GifHeader header, byte[] data, Context context,
        Transformation<Bitmap> frameTransformation, int targetWidth, int targetHeight,
        GifDecoder.BitmapProvider provider, BitmapPool bitmapPool, Bitmap firstFrame) {
    if (firstFrame == null) {
        throw new NullPointerException("The first frame of the GIF must not be null");
    }
    gifHeader = header;
    this.data = data;
    this.bitmapPool = bitmapPool;
    this.firstFrame = firstFrame;
    this.context = context.getApplicationContext();
    this.frameTransformation = frameTransformation;
    this.targetWidth = targetWidth;
    this.targetHeight = targetHeight;
    bitmapProvider = provider;
}
 

private void ensureGifDecoder() {
    if (mGifDecoder != null) return;
    ensureGifHeader();
    GifDecoder.BitmapProvider provider = new GifBitmapProvider(
            Glide.get(mContext).getBitmapPool(),
            Glide.get(mContext).getArrayPool()
    );
    mGifDecoder = new StandardGifDecoder(provider);
    mGifDecoder.setData(mGifHeader, getInputStreamData());
    mGifFrames = mGifDecoder.getFrameCount() + 1;
}
 

public GifDecoder buildDecoder(GifDecoder.BitmapProvider bitmapProvider) {
    return new GifDecoder(bitmapProvider);
}
 

/**
 * Constructor for GifDrawable.
 *
 * @see #setFrameTransformation(Transformation, Bitmap)
 *
 * @param context A context.
 * @param bitmapProvider An {@link GifDecoder.BitmapProvider} that can be used to
 *                       retrieve re-usable {@link Bitmap}s.
 * @param bitmapPool A {@link BitmapPool} that can be used to return
 *                   the first frame when this drawable is recycled.
 * @param frameTransformation An {@link Transformation} that can be applied to each frame.
 * @param targetFrameWidth The desired width of the frames displayed by this drawable (the width of the view or
 *                         {@link com.bumptech.glide.request.target.Target} this drawable is being loaded into).
 * @param targetFrameHeight The desired height of the frames displayed by this drawable (the height of the view or
 *                          {@link com.bumptech.glide.request.target.Target} this drawable is being loaded into).
 * @param gifHeader The header data for this gif.
 * @param data The full bytes of the gif.
 * @param firstFrame The decoded and transformed first frame of this gif.
 */
public GifDrawable(Context context, GifDecoder.BitmapProvider bitmapProvider, BitmapPool bitmapPool,
        Transformation<Bitmap> frameTransformation, int targetFrameWidth, int targetFrameHeight,
        GifHeader gifHeader, byte[] data, Bitmap firstFrame) {
    this(new GifState(gifHeader, data, context, frameTransformation, targetFrameWidth, targetFrameHeight,
            bitmapProvider, bitmapPool, firstFrame));
}